【正确答案】 D

【答案解析】[解析] 主旨题。通过文章的主题句以及各段落主题句可以得知答案。见文章开篇段第一句No one should be forced to wear a uniform under any circumstance可以看出，穿制服不好，接下来简要说明原因：Uniforms are demanding to the human spirit and totally unnecessary in a democratic society．Uniforms tell the world that the person who wears one has no value as an individual but only lives to function as a part of a whole．The individual in a uniform loses all self-worth。所以答案为D)。